Name: Feedback Loops Involved in Homoeostasis
Uploaded: 2019-07-19
Duration: 6 min 55 s
Description: Feedback loops allow living organisms to maintain homeostasis. There are both positive and negative feedback loops. What can happen when a feedback look is altered? Let's find out.

Question

Sl.No.	Column I	Column II	Correct Match
1	Winding of tendril around a support	Chemotropism
2	Growing of roots towards the earth	Thigmotropism
3	Bending of root towards water	Phototropism
4	Growth of pollen tube towards ovule	Geotropism
5	Bending of a shoot towards light	Hydrotropism

Accepted Answer

1. Winding of tendril around a support- Thigmotropism

The winding of tendril around support is by the process of thigmotropism which is governed by the presence of the hormone auxin. When the supporting plant part like in climbers, touches the support, it shows a curvature movement and turns around it.

2. Growing of roots towards the earth- Geotropism

Growing of roots towards the earth surface to absorb the water and minerals for the plant growth is positive geotropism. The plant's stem shows negative geotropism by growing against the stimuli, gravity.

3. Bending of root towards water- Hydrotropism

Bending of root towards the water which is essential for the growth and development of the plant is called hydrotropism. It is a plant's growth response in which the direction of growth is determined by the stimulus water or gradient in water concentration.

4. Growth of pollen tube towards ovule - Chemotropism

The movement of plant parts such as the growth of the pollen tube towards the ovule due to the presence of chemical substances is called chemotropism. The ovary releases these to attract the pollen which develops a tube as it passes through the style of the pistil.

5. Bending of a shoot towards light- Phototropism

Bending of a plant shoot towards the source of the light is called phototropism. This movement is essential for the plant as it performs the process of photosynthesis and makes its own food.

Sl.No. Column I Column II Correct Match

1 Winding of tendril around a support Chemotropism 4

2
Growing of roots towards the earth

Thigmotropism
1

3 Bending of root towards water Phototropism 5

4 Growth of pollen tube towards ovule Geotropism 2

5 Bending of a shoot towards light Hydrotropism 3

Sl.No. Column I Column II Correct Match

1 Winding of tendril around a support Chemotropism

2
Growing of roots towards the earth

Thigmotropism

3 Bending of root towards water Phototropism

4 Growth of pollen tube towards ovule Geotropism

5 Bending of a shoot towards light Hydrotropism

Important Questions on Control & Coordination

Learn and Prepare for any exam you want !

Sl.No. Column I Column II Correct Match 1 Winding of tendril around a support Chemotropism 2 Growing of roots towards the earth Thigmotropism 3 Bending of root towards water Phototropism 4 Growth of pollen tube towards ovule Geotropism 5 Bending of a shoot towards light Hydrotropism

Important Questions on Control & Coordination

Learn and Prepare for any exam you want !

Sl.No. Column I Column II Correct Match

1 Winding of tendril around a support Chemotropism

2
Growing of roots towards the earth

Thigmotropism

3 Bending of root towards water Phototropism

4 Growth of pollen tube towards ovule Geotropism

5 Bending of a shoot towards light Hydrotropism